deafen, as I recall, my '72 108 has a nut under each cover that you pop up. I have not had any difficulty getting a wrench on the nuts and then angle the wiper arms up off the glass in a locked position. This seems to release tension which holds the arms on the shafts while the arms are down (agaijst the glass). The ahole arm assembly is a really snug fit over the splined shafts but some juiggling and pulling upwards always springs mine free. Hope this helps a bit.